APR 2018
20
Hot Water Energy Storage
Unvented Cylinders
GB & NI
Installation & Maintenance Instructions for an unvented
hot water cylinder with external thermal expansion
WIRING DIAGRAMS (CONTINUED)
VARIANT DUAL THERMOSTAT WIRING
The diagrams shown relate to the components listed. Other components and other
manufacturers’ components may vary in their wiring requirements, particularly
thermostats. Always refer to manufacturers’ instructions which may override the
detail in order to function correctly.
VARIANT DUAL THERMOSTAT
WIRING
Wiring Diagram 2 X Two Port
Zone Valves (S-Plan)
VARIANT DUAL THERMOSTAT
WIRING
Wiring Diagram 3 Port Mid
Position (Y-Plan) +2 Port
Valve
1
2
2 Port (HTG)
Room Stat
3
5
4
6
7
8
9
10
1
2 3 4
Br G B1 O G/Y
1
2 Port (DHW)
Br G B1 O G/Y
L N E 4 5 6
Boiler
1
2 3 4
Programmer
Pump
Dual Stat
L
N
C
2
C
2 1
2
2
3
1
2
3
2
3
L
N
5A Supply
1
2
3 Port (HTG)
Room Stat
5A Supply
3
5
4
6
7
8
9
10
1
2 3 4
W G B1 O G/Y
7
2 Port (DHW)
Br G B1 O G/Y
L N E 4 5 6
Boiler
1
2 3 4
Programmer
Pump
Dual Stat
L
N
C
2
C
2 1
2
2
3
1
2
3
2
3
L
N